DS2703UT datasheet(3/20 Pages) DALLAS

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DS2703 SHA-1 Battery Pack Authentication IC

3 of 20

AC ELECTRICAL CHARACTERISTICS

(VPULLUP = 2.7V to 5.5V, TA = -20°C to +70°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

THM Low Delay

tTD

(Note 11)

Computation Delay Time

(Note 12)

100

µs

Computation Time

tSHA

(Note 12)

Programming Pulse Width

tPPW

(Note 5)

Programming Pulse Rise Time

tPPR

0.5

µs

Programming Pulse Fall Time

tPPF

0.5

µs

Start-up Delay Time

tSTRT

(Note 13)

100

AC ELECTRICAL CHARACTERISTICS: 1-Wire INTERFACE

(VPULLUP = 2.7V to 5.5V, TA = -20°C to +70°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

1-Wire INTERFACE REGULAR TIMING

Time Slot

tSLOT

120

µs

Recovery Time

tREC

µs

Write 0 Low Time

tLOW0

120

µs

Write 1 Low Time

tLOW1

µs

Read Data Valid Time

tRDV

µs

Reset Time High

tRSTH

480

µs

Reset Time Low

tRSTL

480

960

µs

Presence Detect High

tPDH

µs

Presence Detect Low

tPDL

240

µs

1-Wire INTERFACE OVERDRIVE TIMING

Time Slot

tSLOT

µs

Recovery Time

tREC

µs

Write 0 Low Time

tLOW0

µs

Write 1 Low Time

tLOW1

µs

Read Data Valid Time

tRDV

µs

Reset Time High

tRSTH

µs

Reset Time Low

tRSTL

µs

Presence Detect High

tPDH

µs

Presence Detect Low

tPDL

µs

Note 1:

VDQ – VTHM. The THM pin must not be driven to a higher voltage than the DQ pin.

Note 2:

The application thermistor cannot exceed the RDQ-THM resistance range over operating temperature. If thermistor mode is not used in the application, it is

recommended that a 50KΩ resistor be connected between DQ and THM pins instead.

Note 3:

Maximum leakage of DQ pin while in thermistor mode.

Note 4:

When performing a Lock Secret (0x6A), Set Overdrive (0x8B) or Clear Overdrive (0x8D) operation, there will be an increased operating current of IPGM-

IDLE during the time period from when the command is issued until the next 1-Wire bus reset. IPGM-IDLE current will be present before and after the program

pulse.

Note 5:

See Figure 11 for definitionof tPPR, tPPW, and tPPF.

Note 6:

All voltages referenced to VSS.

Note 7:

VDQ must be at least 3.0V when the 1-Wire bus is idle.

Note 8:

Drive strength at time=0 after Activate Thermistor command is sent to the DS2703.

Note 9:

Does not include capacitance referred from VB pin on initial power up.

Note 10:

EEPROM data read retention is four years at +50°C

Note 11:

Time from msb of Activate Thermistor command until THM pin is driven low internally.

Note 12:

Time from msb of Compute Next Secret or Compute MAC command.

Note 13:

Time after initial power up before the DS2703 will respond to communication. TSTRT specifications are valid only if the capacitor on VB (CVB) is 0.22µF.

Worst case 100ms delay based on maximum thermistor value of 500kΩ.

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